<?php
if (!isset ($_SESSION)) {
	ob_start();
	session_start();
}
 $con=mysqli_connect("数据库地址","数据库账号","数据库密码","数据库名"); 
 if (mysqli_connect_errno($con)){ 
	 echo "连接 MySQL 失败: " . mysqli_connect_error(); 
 }
 mysqli_query($con,"set names utf8");
 
 function getip(){
	static $ip = '';
	$ip = $_SERVER['REMOTE_ADDR'];
	if(isset($_SERVER['HTTP_CDN_SRC_IP'])){
		$ip = $_SERVER['HTTP_CDN_SRC_IP'];
	}elseif(isset($_SERVER['HTTP_CLIENT_IP']) && preg_match('/^([0-9]{1,3}\.){3}[0-9]{1,3}$/', $_SERVER['HTTP_CLIENT_IP'])) {
		$ip = $_SERVER['HTTP_CLIENT_IP'];
	}elseif(isset($_SERVER['HTTP_X_FORWARDED_FOR']) AND preg_match_all('#\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}#s', $_SERVER['HTTP_X_FORWARDED_FOR'], $matches)) {
		foreach($matches[0] AS $xip){
			if(!preg_match('#^(10|172\.16|192\.168)\.#', $xip)) {
				$ip = $xip;
				break;
			}
		}
	}
	return $ip;
}
function getKey($len, $chars=null){
	if (is_null($chars)){
		$chars = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789";
	}  
	mt_srand(10000000*(double)microtime());
	for ($i = 0, $str = '', $lc = strlen($chars)-1; $i < $len; $i++){
		$str .= $chars[mt_rand(0, $lc)];  
	}
	return $str;
}